BHOWAL, S. K. “A BRIEF REVIEW ON THE THERAPEUTIC RESISTANCE AGAINST CANCER BY CANCER STEM CELL (CSC)”. UTTAR PRADESH JOURNAL OF ZOOLOGY, Vol. 42, no. 7, Apr. 2021, pp. 56-68, https://www.mbimph.com/index.php/UPJOZ/article/view/2052.